I am a new StackOverflow user and I am starting to learn the back-end side of programming.
I use mostly JS client-side so the back-end side has some things that I need to clarify.

I have a problem regarding Node and its connection with the browser, even using browserify.
I know that a browser isn't Node's environment but I need to use that because I need to learn the little details of it.
The problem is, even though I use browserify in order to bound the several npm modules, everytime I try to require MySQL or HTTP or Express, errors occur.
If I use require('http') and/or require('express') this error occurs: TypeError: http.ServerResponse is undefined;
If, instead, I use require('mysql') this error occurs: TypeError: Net.createConnection is not a function

My questions are:
-How can I solve this?
-Those are errors relative to browserify or they would be the same without it, using an environment different from the browser?
I'll prefer not a straightforward solution but an explanation with the code if necessary.

Thank you very much in advance